Ondansetron and Sotalol: Drug Interaction Guide

Quick answer: This is a major interaction — avoid combining Ondansetron and Sotalol unless specifically directed by your doctor.

Interaction severity: Major — avoid combination

How Ondansetron interacts with Sotalol

Both drugs prolong the QT interval (ondansetron via hERG potassium channel blockade, sotalol via class III IKr blockade). Combination increases risk of torsade de pointes.

What you should do

Avoid combination, particularly with IV ondansetron or in patients with electrolyte disturbance. If essential, perform baseline ECG and correct hypokalaemia/hypomagnesaemia.

Key facts

Severity

Major — avoid combination

Mechanism

Both drugs prolong the QT interval (ondansetron via hERG potassium channel blockade, sotalol via class III IKr blockade)...

Action

Avoid combination, particularly with IV ondansetron or in patients with electrolyte disturbance. If essential, perform b...

Important medical disclaimer: This page provides educational information about drug interactions for general reference. It is not a substitute for professional medical advice, diagnosis, or treatment. Always discuss your specific medications with a qualified healthcare provider before starting, stopping, or changing any treatment. About our editorial team.

Frequently asked questions

Can I take Ondansetron and Sotalol together?

No — this combination should generally be avoided. Avoid combination, particularly with IV ondansetron or in patients with electrolyte disturbance. If essential, perform baseline ECG and correct hypokalaemia/hypomagnesaemia.

What is the severity of this interaction?

The interaction between Ondansetron and Sotalol is classified as Major — avoid combination. Both drugs prolong the QT interval (ondansetron via hERG potassium channel blockade, sotalol via class III IKr blockade). Combination increases risk of torsade de pointes.

What should I do if I'm prescribed both?

Avoid combination, particularly with IV ondansetron or in patients with electrolyte disturbance. If essential, perform baseline ECG and correct hypokalaemia/hypomagnesaemia. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

Last reviewed: by iMedic Medical Editorial Team. Our editorial process.